DiscoveryReference Class

DiscoveryReference Class

The base class for discoverable references using XML Web services discovery.

Namespace:  System.Web.Services.Discovery
Assembly:  System.Web.Services (in System.Web.Services.dll)

'Declaration
Public MustInherit Class DiscoveryReference
'Usage
Dim instance As DiscoveryReference

ContractReference, SchemaReference, and DiscoveryDocumentReference all inherit from DiscoveryReference, and represent the three types of documents discoverable through XML Web services discovery: Service Descriptions, XML Schema Definition (XSD) schemas, and discovery documents, respectively.

Imports System
Imports System.IO
Imports System.Web.Services.Discovery
Imports System.Net

Class MyDiscoveryDocumentClass
   Public Shared Sub Main()
      Try 
         Dim myDiscoveryDocument As DiscoveryDocument
         Dim myStreamReader As New StreamReader("c:\Inetpub\wwwroot\dataservice.disco")
         Dim myStream As New FileStream("c:\MyDiscovery.disco", FileMode.OpenOrCreate)
         Console.WriteLine("Demonstrating DiscoveryReference class.")

         ' Read the discovery file.
         myDiscoveryDocument = DiscoveryDocument.Read(myStreamReader)

         ' Create an instance of the DiscoveryReference class. 
         Dim myDiscoveryReference As MyDiscoveryReferenceClass
         myDiscoveryReference = New MyDiscoveryReferenceClass()

         Dim myDiscoveryClientProtocol As New DiscoveryClientProtocol()
         myDiscoveryClientProtocol.Credentials = _
             CredentialCache.DefaultCredentials

         ' Set the client protocol.
         myDiscoveryReference.ClientProtocol = myDiscoveryClientProtocol

         ' Read the default file name.
         Console.WriteLine("Default file name is: " _
             & myDiscoveryReference.DefaultFilename)

         ' Write the document.
         myDiscoveryReference.WriteDocument(myDiscoveryDocument, myStream)

         ' Read the document.
         myDiscoveryReference.ReadDocument(myStream)

         ' Set the URL.
         myDiscoveryReference.Url = "http://localhost/dataservice.disco"
         Console.WriteLine("Url is : " + myDiscoveryReference.Url)

         ' Resolve the URL.
         myDiscoveryReference.Resolve()

         myStreamReader.Close()
         myStream.Close()

      Catch e as Exception
         Console.WriteLine("Exception caught! - {0}", e.Message)
      End Try 

   End Sub 

End Class 


' Class derived from DiscoveryReference class and overriding it members. 
Class MyDiscoveryReferenceClass
   Inherits DiscoveryReference
   Private myDocumentUrl As String 

   Public Overrides ReadOnly Property DefaultFilename() As String 
      Get 
         Return "dataservice.disco" 
      End Get 
   End Property 

   Public Overrides Function _
      ReadDocument(ByVal stream As System.IO.Stream) As Object
      Return stream
   End Function 

   Public Overloads Sub Resolve()
      Try 
         Dim myDiscoveryRefDocument As DiscoveryDocument
         myDiscoveryRefDocument = MyBase.ClientProtocol.Discover(Url)
      Catch e As Exception
         Throw e
      End Try 
   End Sub 

   Protected Overloads Overrides Sub _
      Resolve(ByVal contentType As String, ByVal stream As Stream)
   End Sub 

   Public Overrides Property Url() As String 
      Get 
         Return myDocumentUrl
      End Get 

      Set(ByVal Value As String)
         myDocumentUrl = Value
      End Set 
   End Property 

   Public Overrides Sub WriteDocument _
      (ByVal document As Object, ByVal stream As System.IO.Stream)
      Dim myDiscoveryDocument As DiscoveryDocument = _
          CType(document, DiscoveryDocument)
      myDiscoveryDocument.Write(stream)
   End Sub 
End Class
#using <mscorlib.dll>
#using <System.Xml.dll>
#using <System.Web.Services.dll>
#using <System.dll>
using namespace System;
using namespace System::IO;
using namespace System::Web::Services::Discovery;
using namespace System::Net;

// Class derived from DiscoveryReference class and overriding it members.
__gc class MyDiscoveryReferenceClass : public DiscoveryReference
{
private:
   String* myDocumentUrl;
public:
   __property String* get_DefaultFilename()
   {
      return S"dataservice.disco";
   }

   Object* ReadDocument(Stream* stream)
   {
      return stream;
   }

   void Resolve()
   {
      try
      {
         DiscoveryDocument* myDiscoveryRefDocument;
         myDiscoveryRefDocument = DiscoveryReference::ClientProtocol->Discover(Url);
      }
      catch (Exception* e)
      {
         throw(e);
      }
   }

protected:
   void Resolve(String* /*contentType*/, Stream* /*stream*/) {}

public:
   __property String* get_Url()
   {
      return myDocumentUrl;
   }

   __property void set_Url( String* value )
   {
      myDocumentUrl = value;
   }

   void WriteDocument(Object* document, System::IO::Stream* stream)
   {
      DiscoveryDocument* myDiscoveryDocument = dynamic_cast<DiscoveryDocument*>(document);
      myDiscoveryDocument->Write(stream);
   }
};

int main()
{
   try {
      DiscoveryDocument* myDiscoveryDocument;
      StreamReader* myStreamReader =
         new StreamReader(S"c:\\Inetpub\\wwwroot\\dataservice.disco");
      FileStream* myStream = new FileStream(S"c:\\MyDiscovery.disco",
         FileMode::OpenOrCreate);
      Console::WriteLine(S"Demonstrating DiscoveryReference class.");

      // Read discovery file.
      myDiscoveryDocument = DiscoveryDocument::Read(myStreamReader);

      // Create a new instance of the DiscoveryReference class.
      MyDiscoveryReferenceClass* myDiscoveryReference;
      myDiscoveryReference =  new MyDiscoveryReferenceClass();

      DiscoveryClientProtocol* myDiscoveryClientProtocol =
         new DiscoveryClientProtocol();
      myDiscoveryClientProtocol->Credentials =
         CredentialCache::DefaultCredentials;

      // Set the client protocol.
      myDiscoveryReference->ClientProtocol = myDiscoveryClientProtocol;

      // Read the default file name.
      Console::WriteLine(S"Default file name is: {0}", myDiscoveryReference->DefaultFilename);

      // Write the document.
      myDiscoveryReference->WriteDocument(myDiscoveryDocument,myStream);

      // Read the document.
      myDiscoveryReference->ReadDocument(myStream);

      // Set the URL.
      myDiscoveryReference->Url = S"http://localhost/dataservice.disco";
      Console::WriteLine(S"Url is: {0}", myDiscoveryReference->Url);

      // Resolve the URL.
      myDiscoveryReference->Resolve();

      myStreamReader->Close();
      myStream->Close();
   }
   catch (Exception* e)
   {
      Console::WriteLine(S"Exception caught! - {0}", e->Message);
   }
}

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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